Okay, graduation is coming up and I want to get my first DSLR. I have canon lenses and am happy with the brand. I have been trying to decide between the Canon 20D and the 30D. Are there any big differences that would effect the quality or ease of use of the camera. Adorama has the 30D for $640 refurbished-body only, and I see on ebay that Canon 20D's are selling for a max of $500... Opinions?